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%I #6 May 10 2023 22:38:46
%S 1,0,1,22,81015,78954264778,28097782272713021650,
%T 5303746708038163087962610366540,
%U 750301169575330570948709311656320180808090293,107340347538849305728376873042317973326061404804760169389400111,20170881768834535901905153264317820972982675109510814553304001503205327205300015737
%N Number of nonisomorphic multisets of fixed-point-free endofunctions on an n-set with n endofunctions.
%C Isomorphism is up to permutation of the elements of the n-set.
%H Andrew Howroyd, <a href="/A362902/b362902.txt">Table of n, a(n) for n = 0..25</a>
%Y Main diagonal of A362899.
%Y Cf. A277839.
%K nonn
%O 0,4
%A _Andrew Howroyd_, May 10 2023